#173B5A#173B5A

#173B5A is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.2% C 0.068 H 247.4°. Best body text is #FFFFFF at 11.60:1 contrast (WCAG AA passes).

Color values

HEX	#173B5A
RGB	rgb(23, 59, 90)
HSL	hsl(208, 59%, 22%)
HSV	hsv(208, 74%, 35%)
CMYK	cmyk(74.4%, 34.4%, 0%, 64.7%)
CIE-LAB	lab(23.83, -1.28, -22.32)
CIE-LCH	lch(23.83, 22.36, 266.72°)
OKLab	oklab(34.24% -0.0263 -0.0632)
OKLCH	oklch(34.24% 0.068 247.4)
XYZ	xyz(3.7621, 4.0479, 10.2539)
Luminance	0.0405 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B5A #5A3617

analogous

#175A58 #173B5A #171A5A

triadic

#173B5A #5A173B #3B5A17

tetradic

#173B5A #58175A #5A3617 #1A5A17

square

#173B5A #58175A #5A3617 #1A5A17

split-complementary

#173B5A #5A171A #5A5817

monochromatic

#061018 #0B1B29 #173B5A #235B8B #307BBB

Accessibility & contrast

On white

11.60

#173B5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#173B5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B5A

11.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B5A	#FFFFFF	#000000	##FFFFFF
##173B5A	1.00	11.60	1.81	11.60
#FFFFFF	11.60	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2D3C5B

Deuteranopia (green-blind)

#243659

Tritanopia (blue-blind)

#004246

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #173b5a;
/* rgb */ color: rgb(23, 59, 90);
/* oklch */ color: oklch(34.2% 0.068 247.4);

Tailwind

colors: {
  custom: {
    50: '#5d7089',
    500: '#173b5a',
    950: '#000000',
  },
}

SCSS

$custom: #173b5a;
$custom-light: #5d7089;
$custom-dark: #000000;

JSON

{
  "hex": "#173b5a",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 90
  },
  "hsl": {
    "h": 207.761,
    "s": 59.292,
    "l": 22.157
  },
  "oklch": {
    "l": 0.34235,
    "c": 0.06844,
    "h": 247.4
  },
  "luminance": 0.04048
}

Semantic roles & 50–950 ramp

primary

#173B5A

secondary

#91633C

accent

#8E45E2

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #173B5A

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →